AS with a naughty but appealing puppy, people can’t help forgiving Bill Clinton his trespasses. When Pardongate broke in January, many supporters said it was the last straw and that they could no longer admire the former president, nor be around him. I recall Bill Rollnick and Nancy Ellison, two of Clinton’s best friends and biggest fund-raisers, saying something to this effect one night in Elaine’s, at the height of the Marc Rich scandal. So imagine my surprise to learn that the Rollnicks gave a swell dinner for Bill and Hillary Rodham Clinton on Martha’s Vineyard the other evening. And one of the guests was “America’s most trusted man,” Walter Cronkite. Say what you like about Bill, he’s surely got charisma (or is it chutzpah?) to burn.